﻿// Copyright (c) 2012, Alexander Endris
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// * Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
// IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#region Usings

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;

#endregion

namespace JungleTimer.Windows
{
  public static class Helper
  {
    #region Public / Methods

    public static Region BitmapToRegion(Bitmap image, Color keyColor)
    {
      return new Region(BitmapToGraphicsPath(image, keyColor));
    }

    #endregion

    #region Private / Methods

    private static GraphicsPath BitmapToGraphicsPath(Bitmap image, Color keyColor)
    {
      GraphicsPath output = new GraphicsPath();

      BitmapData data = image.LockBits(new Rectangle(0, 0, image.Width, image.Height), ImageLockMode.ReadOnly,
                                       image.PixelFormat);

      IntPtr dataPointer = data.Scan0;

      byte[] bytes = new byte[data.Stride*image.Height];

      Marshal.Copy(dataPointer, bytes, 0, bytes.Length);

      image.UnlockBits(data);

      int stride = data.Stride/data.Width;

      for (int y = 0; y < image.Height; y++)
      {
        for (int x = 0; x < image.Width; x++)
        {
          int offset = (x*stride + y*data.Stride);

          Color c = Color.FromArgb(bytes[offset], bytes[offset + 1], bytes[offset + 2]);

          if (c.R != keyColor.R && c.G != keyColor.G && c.B != keyColor.B)
          {
            int start = x;


            for (; x < image.Width; x++)
            {
              offset = (x*stride + y*data.Stride);
              c = Color.FromArgb(bytes[offset], bytes[offset + 1], bytes[offset + 2]);
              if (c.R == keyColor.R && c.G == keyColor.G && c.B == keyColor.B)
                break;
            }

            output.AddRectangle(new Rectangle(start, y, x - start, 1));
          }
        }
      }

      return output;
    }

    #endregion
  }
}